I think you have an issue in your database schema. You're creating an index on the polls table for the column ts that doesn't exist. I'm not sure if the field needs to be added or if the index should be removed.

Just pushed an update with a version bump that I feel merits mention here. Notably, adding a custom color for the percentage bars per poll and fixing compatibility so you can embed multiple polls on one page (this change may break some existing custom CSS). There are a few other changes as well listed in the commit description.
As always, feedback is appreciated.